$Hi, Damien_bug the vast majority of service, parts fiche, and owners manuals on the internet are "FREE" to download and all service manuals contain wiring diagrams in the back pages. The rest usually charge a modest fee of $15 and there is a handful of obscure, rare, obsolete, and very old models that are no longer or never were available and some were never printed in English. The Indian and Philippine markets are usually in E-book format only, for these rare occasions I shall look on eBay and find the cheapest one available. Most of the manuals will cover your exact make, model, and year otherwise one will be provided that comes as close as possible to your bike and will have most of the same info that an exact manual would have. If there is no $ sign after the manual link it is free to download.
To download your manual for viewing or printing please click on the blue links below. Good luck and have a wonderful dayKawasaki KLX300R service manual repair 1997 2005 KLX300 Download Manuals... $15OEM Parts for KawasakiDownload Manual 1998 Kawasaki KLX300R Owner ManualKawasaki KLX 300Rhttps://en.wikipedia.org/wiki/List_of_Kawasaki_motorcycles

Hi, Xim1645 a regulator-rectifier on a motorcycle converts alternating current to direct current. The reason you need one on a bike is that the bike is equipped with an alternator, which is just a device that takes power (in the form of rotation) from the engine and converts it into alternating current (AC). Think of the alternator as a type of generator. Now AC is a fine source of power for lights, but you can't feed AC into a battery or into a fuel injection computer and expect it to work.
The rectifier's job is to convert this AC power into Direct Current power so it can be used to charge the bike's battery and otherwise power all the 12 volts (DC) devices on your bike (electronics, tachometer, etc.) It's worth mentioning that generally a rectifier is combined with a voltage regulator, which makes sure the alternator doesn't generate too much (or too little) power/voltage. If your alternator were to generate too much voltage you'd risk overcharging the battery, burning out your bike's electronics, etc. And if it generated too little your battery would slowly drain (this is the most common failure in a voltage regulator) I bring this up because on most bikes they tend to combine these two functions into a single rectifier/regulator. It is also worth mentioning that all rectifier/voltage regulator must be physically or electronically (by wire) grounded in order to function properly.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.Kawasaki KLX300R service manual repair 1997 2005 KLX300 Download Manuals... $15OEM Parts for Kawasaki1999 Kawasaki KLX300R Owner ManualKawasaki KLX 300Rhttps://en.wikipedia.org/wiki/List_of_Kawasaki_motorcycles

Hey Bently,
sorry, there is no way to do anything to the transmission without tearing the engine down,,, DO NOT ride this atv again ,,you WILL cause more damage to the engine/transmission... It could/possibly be in the drive train...either way - take it to a qualified professional...

Hi, Scott I would love to help you but you are not going to believe this the batteries in my crystal ball are dead and my mental telepathy headset is broken. I'm not sure if you are talking about your dirt bike or a gun, you need to be more specific please provide this information in the comment section below and after you post it, a comment alert icon appears on my screen that will allow me to respond to your original question in another comment box below yours. Good luck and have a nice day.

You said the motor cut out and popped and backfired when it quit, this is almost always one of two things; either the low speed pulse coil or the actual CDI "black" box. You will almost never lose a main coil. One thing I would also check to make sure did not happen is shearing a flywheel mag key. When the motor backfires you can easily shear a mag key if you have a heavy flywheel, (external). However when this happens you don't usually lose spark but it will certainly cause the backfire. One other item of importance is that the bike you are in question about does not emit a bright spark when you are checking for fire. Make sure you are using a brand new plug and ground it on the head. Try to make sure you are in a dark environment when you check the spark.